物质: matter; substance; material 短语和例子可裂变物质 fissionable material; nuclear materials; 物质以三种形态存在: 固态、 液态和气态。 matter exists in three states: solid, liquid and gas.; 物质不灭定律 the law of conservation
Example Sentences:
1.
Physical protection of nuclear materials 核物质保护
2.
" physical protection of nuclear material . " protection of material . international atomic energy agency 核物质的物理性保护核物质保护，国际原子能总署。
